CN1325291C - Pneumatic tyre - Google Patents

Pneumatic tyre Download PDF

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Publication number
CN1325291C
CN1325291C CNB028030397A CN02803039A CN1325291C CN 1325291 C CN1325291 C CN 1325291C CN B028030397 A CNB028030397 A CN B028030397A CN 02803039 A CN02803039 A CN 02803039A CN 1325291 C CN1325291 C CN 1325291C
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CN
China
Prior art keywords
tire
strengthening layer
rope
outer end
zone
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CNB028030397A
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Chinese (zh)
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CN1476388A (en
Inventor
和气充幸
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2001268229A external-priority patent/JP4559672B2/en
Priority claimed from JP2001393069A external-priority patent/JP4070454B2/en
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Publication of CN1476388A publication Critical patent/CN1476388A/en
Application granted granted Critical
Publication of CN1325291C publication Critical patent/CN1325291C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/06—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead
    • B60C15/0603—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex
    • B60C15/0607—Flipper strips, fillers, or chafing strips and reinforcing layers for the construction of the bead characterised by features of the bead filler or apex comprising several parts, e.g. made of different rubbers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10819—Characterized by the structure of the bead portion of the tire
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10819—Characterized by the structure of the bead portion of the tire
    • Y10T152/10828—Chafer or sealing strips
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10819—Characterized by the structure of the bead portion of the tire
    • Y10T152/10837—Bead characterized by the radial extent of apex, flipper or chafer into tire sidewall
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T152/00—Resilient tires and wheels
    • Y10T152/10—Tires, resilient
    • Y10T152/10495—Pneumatic tire or inner tube
    • Y10T152/10819—Characterized by the structure of the bead portion of the tire
    • Y10T152/10846—Bead characterized by the chemical composition and or physical properties of elastomers or the like

Abstract

A pneumatic tire comprising a radial carcass 5 of at least one carcass ply comprised of a main body portion 3a and a turnup portion 3b, and a reinforcing member 7 comprised of at least two reinforcing layers, in which at least two reinforcing layers 6a, 6b among reinforcing layers 6a, 6b, 6c constituting the reinforcing member 7 are cross reinforcing layers 21 arranged so as to envelop at least the turnup portion of the radial carcass 5 and cross cords of these layers with each other, and outer ends 14a, 14b of the reinforcing layers 6a, 6b constituting the cross reinforcing layers 21 and located outward from the turnup portion 3b of the radial carcass 5 in the widthwise direction of the tire are outward from an outer end 13 of the turnup portion 3b of the radial carcass 5 in the radial direction of the tire, and the cords constituting each of the reinforcing layers 6a, 6b, 6c are cords having given properties, and a crossing angle a between cords of adjacent reinforcing layers 6a, 6b with respect to a circumferential direction 15 of the tire is more than 50 DEG but is less than 130 DEG .

Description

Air-inflation tyre
Technical field
The invention relates to that a kind of airtyred durability improves, and particularly relevant for the durability of bead part.
Background technology
When gas filed radial-ply tyre (radial tire) rolls under load, some in the side area that contacts the ground-surface tyre surface can be significantly crooked, and the significantly situation of distortion can take place toward the radial direction of tire in the part of the exterior tyre bead of diametric(al) (bead) portion that is positioned at the wheel frame flange (rim flange) of wheel, shown in the 21st figure, and the situation that each and ground will take place significantly to be out of shape outward when touching.Such metaboly can apply a big shearing strain at tire width direction and turn on the radial ply tire between near the rubber radial ply tire (carcass) and the tire width direction on the peripheral region of regional outer end, and therefore has the problem that tyres durable power is degenerated.
In addition, distortion at about tire circumferential direction can occur in sidewall sections, and the end portion of tire landing ground and floor contact surface, so shearing strain also can be applied in carcass on turn on the position of regional outer end, therefore and have the problem of tyres durable sexual involution.
Be used for truck, in the gas filed radial-ply tyre of heavy loads such as bus, after being installed to the wheel frame, the internal pressure of suggestion can be set at a higher progression, but in the situation of using high internal pressure, the reversal of stress of internal pressure applies a compressive force being clipped on the rubber part that turns over bead part between zone and the wheel frame flange (such as rubber-reinforced layer that contact with tyre bead) on the casingply of bead part, so the diametric(al) of rubber section branch along wheel edge edge toward tire outwards moves, the ratio regular meeting of deflection is corresponding with compressive force, therefore the rope of using high rigidity (rigidity) similarly is that the steel wire or the similar object of difficult distortion are strengthened body piles, big shearing strain meeting occur in the outside face rubber that constitutes body piles on turn on the zone, the shearing strain meeting of turning over regional outer end thus on body piles becomes bigger.
As being controlled at the device that turns over the shearing strain of regional outer end on the body piles, at least to there be one deck strengthening layer to be positioned at an outer end, this outer end is positioned at by tyre bead turns over side outside the regional outer end on the diametric(al), use by the outer end of turning over the zone on being positioned at toward the outer end portion conveyer dysfunction core of strengthening layer, these are such as in Japanese Patent JP-A-11-20423 etc. exposure being arranged.
In JP-A-8-225005, disclosed the device of a control shearing strain, can realize with the tyre bead weighting material.
Yet, in the Pneumatic belt tire of nearest heavy burden usefulness, also can promote to some extent aspect the planarization of section, the input toward bead part during such planarization meeting allows and rotates increases.In addition, see through in the renovation used tire, the durability of bead part also can't be used the device of the control shearing strain of stating and do enough liftings, therefore needs further to improve.
In the structure that in JP-A-11-20423, discloses, dysfunction still can occur in carcass on turn over the outer end portion in zone, and to have a problem be exactly strengthening layer to the protection action in the zone of main dysfunction and not enough.
In the low area section, aspect ratio can not surpass 60% large scale tire, and it is exactly not only to cause the too early degeneration of new tire in the dysfunction of bead part that a very serious problem is arranged, and can allow the number of times of used tire renovation reduce yet.
Summary of the invention
Therefore, purpose of the present invention is providing a kind of air-inflation tyre exactly, by suitably disposing staggered strengthening layer with particular form, even planarization and the renovation repeatedly of implementing tire in recent years radial-ply tyre, the shearing strain that produces in Width and peripheral direction when this air-inflation tyre rotates under load, to turn over location on the carcass of bead part can be enough low with falling being positioned at, to improve the durability of bead part.
A further object of the present invention provides a kind of air-inflation tyre, is positioned at the outermost carcass plies that turns over the zone on the carcass by utilization, and by the weight that increases to suppress that sets of strengthening the unit, improves the durability of bead part.
In order to reach above-mentioned and other purpose of the present invention, the air-inflation tyre that first purpose is mentioned according to the present invention, this air-inflation tyre comprise a radial ply tire and tyre bead weighting material.This radial ply tire is made of at least one body piles, this body piles extends between the tyre bead core that is embedded in pair of bead portion respectively with comprising a base portion toroid, can be extended and winding tyre bead core and the position tyre bead weighting material above above-mentioned tyre bead core by main part and turn over the zone on being somebody's turn to do; This tyre bead weighting material comprises a below rubber part and a top rubber part, and the rubber part of this below is arranged on the exterior circumferential surface adjacent to the tyre bead core; The rubber part of rubber part position below this of this top the diametric(al) outside, its rigidity can be also lower than below rubber part.It is characterized in that this air-inflation tyre comprises that is also strengthened a unit, this reinforcement unit is made of the two-layer at least strengthening layer with the rubber coating, each strengthening layer contains steel wire or the organic fiber rope of placing with parastate each other, and constituting at least two strengthening layers of strengthening the unit, it is the staggered strengthening layer of settling, use surround at least radial ply tire on turn over the zone, and allow these layers interlaced with each other across, those strengthening layers are positioned at, on the tire width direction, turn over the outside, outer end in zone on the radial ply tire, and two outer ends that constitute the strengthening layer of staggered strengthening layer are to be placed on, on the tire width direction, turn over the outside at the place, an outer end in zone on the radial ply tire, and constitute the steel wire of each strengthening layer or organic fiber rope is to see through fine rule is twisted with the fingers strand to form together, and wherein the elasticity modulus of each bar fine rule is not less than 40GPa, and each bar steel wire or the bending stiffness of organic fiber rope is no more than 2GPamm 4, the bending stiffness (GPamm of each strand 4) result that multiply by at the terminal number (cords/mm) of steel wire or organic fiber rope is 0.012-0.62 (GPamm 4Cords/mm), the circumferencial direction that the stagger angle between the rope of adjacent strengthening layer (α) corresponds to tire can surpass 50 degree, but less than 130 degree.
In addition, use at this " elasticity modulus of fine rule " this vocabulary shows that single of tension twists with the fingers the elasticity modulus that the fine rule of strand obtains.
Usually, when the pneumatic radial tire of loading onto the wheel frame is received in gas when having internal pressure, the power of extruding can see through internal pressure be applied to opposite force be clipped in radial ply tire on turn over regional outer end and take turns rubber part between the frame flange, and rubber section branch is mobile outward in the diametric(al) of tire by the top ends of wheel frame flange as a result, and the Width toward tire outwards moves then.
Opposite, the radial ply tire with rope is strengthened owing to the opposite force that above-mentioned internal pressure produces, makes radial ply tire be not easy very much distortion.So, turning on the radial ply tire between regional outer end and the rubber part thereon, can be created in the shearing strain on the Width of tire.
When tire rolls under loaded situation, shearing strain meeting at tire width direction becomes bigger, according to first purpose of the present invention, the reinforcement unit of having arranged the strengthening layer by two-layer at least rubber to constitute, each strengthening layer contains the steel wire or the organic fiber rope of high rigidity, be to form through cord placement parallel to each other that per share elasticity modulus is not less than 40Gpa and sth. made by twisting strand together, these constitute the strengthening layer of strengthening the unit, wherein have at least two-layer, it is the strengthening layer that is staggeredly placed, use envelope radial ply tire on turn over the zone, and make the cord of these layers together interlaced with each other.And be formed in the Width of tire by the two ends of turning over the strengthening layer of placing outward in the zone on the radial ply tire, can be placed on the diametric(al) of tire, turn on the radial ply tire outside the outer end in zone, so above-mentioned compressive force can utilize the rubber that is positioned at by outside the strengthening layer Width to sponge, its be positioned at tire Width radial ply tire on turn over the zone the outer end place outward, so can and not be positioned on its rubber on every side and cause a such compressive force in the outer end of turning over the zone on the radial ply tire, the situation that so in the Width of tire, produces shearing strain can avoid occurring in tire width direction outward rubber and the radius carcass on turn between the regional outer end, and therefore can understand the durability of the bead part that near tire flat board place can be crooked and the number of times of renovation again of tire.
In addition, in air-inflation tyre of the present invention, see through and place two layers of reinforced material at least, wherein each layer contains aforesaid high rigid cord, can control tire and constitute object, similarly be casingply or the similarly distortion of object at the circumferencial direction of tire, this can observed by a zone of the curve of the bead part that is positioned at relative ground contact surface, when particularly under the state of load, rolling in fore-end and tail end office, use the shearing strain at tire circumferential direction can be controlled in radial ply tire on turn near the zone, therefore and be appreciated that near the durability of the bead part dull and stereotyped flexible tire and the number of times of renovation again of tire.
In addition, first purpose of the present invention can be used in a situation, exactly ought be wherein each contain storehouse that two strengthening layers of organic fiber rope can be one by one together, so the rope of strengthening layer can interlock each other, be known half of strengthening layer do not installed in the shearing strain of the circumferencial direction of tire.In order to improve this effect, must allow the elasticity modulus of the cord that constitutes the strengthening layer rope greater than 40GPa, also must allow in addition between the rope of adjacent strengthening layer stagger angle α with respect to the circumferencial direction of tire be greater than 50 ° but less than 130 °.
In first purpose of the present invention, constitute the steel wire of each strengthening layer or organic fiber rope and be to see through and twist with the fingers the strand cord and form, and every steel wire or the bending stiffness of organic fiber rope is no more than 2GPamm 4Use the outside rubber deformation that strengthening layer can and then be positioned at the Width of tire easily, therefore and resulting from strengthening layer with between the rubber outside the tire width direction, shearing strain on tire circumferential direction and the Width can be suppressed, in order to avoid the strengthening layer outer end be the separating of the rubber around it, use the excellent rigidity of the bead part that is implemented in tire.
In addition, according to first purpose of the present invention,, must allow the bending stiffness (GPamm of each strand in order to bring into play above-mentioned effect fully 4) result that multiply by at the terminal number (cords/mm) of steel wire or organic fiber rope is 0.012-0.62 (GPamm 4Cords/mm).
In first purpose of the present invention, more suitable is at a strengthening layer that constitutes the strengthening layer of strengthening the unit is a wide strengthening layer, use a zone that surrounds radial ply tire, this regional scope by on turn over the zone to base portion, and the inner of wide strengthening layer, on the Width of tire, be placed on the inboard of the main part of radial ply tire; And the inner of the strengthening layer that this is wide on diametric(al), is placed on the outside of outer end of the below rubber part of the tyre bead weighting material that constitutes tire.
The embodiment of known placement strengthening layer; usually can be in conjunction with the strengthening layer of two kinds; that is to say that one deck strengthening layer can be provided with in order to turn over regional outer end on the covering radial ply tire; and one deck strengthening layer can be provided with in order to across a zone, and this zone is by the outer end vicinity of inboard to radial ply tire toward top of the main part Width of the radial ply tire of tire.If use wide strengthening layer, can reach the effect same, and can distinguish expendable weight and reduce cost of manufacture with the strengthening layer of above-mentioned 2 kinds.
In addition, wide strengthening layer can be by combining along a plurality of separation strengthening layer of the circumferencial direction of tire zone respectively, in this case, the rigidity of the strengthening layer fragment of separating can be according to its purpose, see through change respectively its rope and same be to reach in the placement angle in plurality of separate strengthening layer zone, but, preferably see through separation point is placed on by turn over place, regional outer end on the radial ply tire in the radial direction of tire in interior scope of extremely turning between the regional outside on the radial ply tire of the Width of tire because probably separating the branch defection between strengthening layer zone and rubber around it because have in rigidity on the separation point under the situation of stage difference and be created in ahead of time on the separation point.
In addition, if separation point is to be positioned at above-mentioned scope, can be the main part inside of the radial ply tire in the Width of tire, or the radial ply tire in the Width of tire on turn over the zone outside, or may be placed on a plurality of positions.
In first purpose of the present invention; more suitable is to set protective cover; this protective cover uses rubber coating cotton rope; this cotton rope is to twist with the fingers strand by each elasticity modulus less than the fiber of 40Gpa to form together; this protective cover is being strengthened between unit and the carcass in order to surround at least, and/or turns over the outer end in the outside, zone on the radial ply tire of the tire width direction of staggered strengthening layer.
In this case, in the end portion of strengthening layer and separating and to be controlled between its rubber on every side, with the rigidity of the bead part in the further enhancement tire.
In first purpose of the present invention, more suitably be in the Width of tire radial ply tire on turn over the zone outside and place one deck cushion layer rubber layer.
In addition, in order to place such cushion layer rubber layer, turning over the placement shape in zone on the radial ply tire, seem on the staggered face in the Width of tire, may be a general straight shape, or one be bending or curved shape.
When turning over the outside in zone on the radial ply tire in strengthening layer is placed on the Width of tire, fracture tendency is in occurring in the place that strengthening layer upper branch of meridian carcass arrives easily.In air-inflation tyre of the present invention, howsoever, the yielding rubber layer can be placed on radial ply tire on turn over the zone outside, use and can avoid the phenomenon of fracture propagation, with the further durability that improves the bead part in the tire to strengthening layer.
In addition, such yielding rubber layer not only can be avoided the propagation of rupturing, because interior pressure and its counter-force, can also relax and be clipped in the compressive force that produces on the rubber areas of turning on the radial ply tire between regional outer end and the wheel flanges, to be controlled at the shearing strain in the tire width direction between the outer end of turning over the zone on rubber areas and the radial ply tire, to use the endurance ability of the bead part in the tire is enhanced further.
In addition, the hardness of cushion layer rubber layer can be in being coated on the rope that constitutes radial ply tire so that the rubber that reaches above-mentioned mitigation compressive force to be provided, and preferable rubber or the same rubber material of tyre bead weighting material that can use with sidewall is to avoid will increasing the rubber kind considering of cost of manufacture.
In addition, add under the importance that weight reduces in first purpose of the present invention, be preferably with strengthening layer only be placed on carcass on turn over a regional side.
The air-inflation tyre that second purpose according to the present invention provides, this air-inflation tyre comprises carcass and strengthens the unit, this carcass by main part and on turn over zone institute and constituted, extend between the tyre bead core that is embedded into pair of bead portion respectively the main part toroid, this carcass is made of at least one line layer, this carcass plies is with the rubber coating, on turn over the zone and can extend and twine the tyre bead core by main part, and the high rigidity rope of its meta in base portion can be along radially placing, this reinforcement unit is made of at least one strengthening layer, and this strengthening layer is made of the high rigidity rope that is coated with rubber; It is characterized in that on constituting this, turning in the carcass plies in zone, at least be arranged in the outermost carcass plies of the outermost carcass plies of tire width direction, has at least one curve, this curve changes the bearing of trend of rope, and this outermost carcass plies is along the most inboard strengthening layer that is positioned at outside layer on the adjacent strengthening layer; And this air-inflation tyre also is formed with a staggered rope portion, should staggered rope portion be formed, and the rope of the staggered rope section of formation can be less than 50 ° with respect to a stagger angle of the circumferencial direction of this tire by the upper lateral part and the inner most strengthening layer that are positioned at by the tire outermost radial outside.
In second purpose of the present invention, the circumferencial direction that more suitable is with respect to tire, extension angular range at the rope of this inner most strengthening layer is 20 °-55 °, and with respect to the circumferencial direction of this tire, is 30 °-55 ° at the extension angular range of the rope of this outermost strengthening layer.
In second purpose of the present invention, more suitable is curve, the wheel frame that tire is installed in standard with impose under the maximum air pressure state thereon, be in the 0.01-0.5 scope doubly of the distance between a position of counting outermost carcass plies outer end by the height of wheel frame flange.
In second purpose of the present invention, a length of the more suitable diametric staggered rope section that is also included within tire can be less than 20mm.
In second purpose of the present invention, more suitable is constitutes at least that the high rigid cord of outermost carcass plies and inner most strengthening layer is steel wire or aromatic polyamides dead drunk (aramid) textile rope, specifically uses an elasticity modulus that constitutes all cords of high rigid cord at outermost carcass plies and inner most strengthening layer to be not less than 40Gpa at least.
In second purpose of the present invention, this strengthening layer only is placed on a side of turning over the zone on the carcass.
In second purpose of the present invention, more suitable is also to comprise a pair of yielding rubber layer, in the radial extension of the diametric outer end of the tire of outer end that comprises the outermost carcass plies and inner most strengthening layer, this to the yielding rubber layer by the outside of the Width of tire and inboard clamp above-mentioned outside end, this is to hardness of yielding rubber layer 0.95-1.05 for the hardness of the rubber that constitutes the outer end with the outer end that is arranged in the outermost carcass plies and inner most strengthening layer more lateral.
In addition, when the normal n1 of an outer surface of tire, the outer end position of passing the diametric staggered rope section of tire; And the normal n2 of an outer surface of tire, when passing on the tire diameter direction of outer end position of the outer end position that is positioned at inner most strengthening layer and outermost carcass plies an outermost outermost end position, section from the Width of tire, on normal n1, measure by the rope center of the base portion of body piles toward the distance of the outer end position of the staggered rope section of tire diameter direction be with said method the outside face amount of tire to a distance 0.4-0.7 doubly, and be 0.7-0.9 times of outside face distance that measures tire with mode same as described above toward the distance between the position of outermost end measuring on the normal n2 by the rope center of the base portion of body piles.
Various embodiments of the present invention will cooperate icon to do detailed explanation.
The 1st figure illustrates in the air-inflation tyre into first purpose according to the present invention, be loaded under the situation on the wheel frame, the Width section-drawing that comprises a base portion of bead part, wherein bead part of label 1 expression, tyre bead core of label 2 expressions, label 4 are that strengthening layer label 7 is for strengthening the unit for tyre bead weighting material, label 5 expression radial ply tires, label 6a-6c.
The wheel that has bead part 1 in the 1st figure comprises a radial ply tire 5, it has at least one body piles, this body piles comprise a main part 3a and on turn over regional 3b, extend to this main part 3a toroid and be embedded in the partly tyre bead core 2 of 1 (in the 1st figure, only demonstrating on one side) of pair of bead, turn on this that regional 3b is extended by main part 3 and around tyre bead core 2 and the tyre bead weighting material 4 that is positioned at tyre bead core 2 tops.
In addition, tyre bead weighting material 4 comprises a below rubber part 4a and a top rubber part 4b, below rubber part 4a places the outer circumference surface adjacent to tyre bead core 2, be to make with harder rubber, top rubber part 4b places the outside adjacent to the below rubber part 4a in the radial direction of tire, is to use than the below softer rubber of rubber part 4a to make.
The main strengthening layer that is characterised in that accurate placement is staggered of the framework of the present invention's first purpose, more specifically, tire comprises strengthens unit 7, this reinforcement unit 7 is made of the two-layer at least strengthening layer with the rubber coating, wherein the strengthening layer with the rubber coating contains steel wire or the organic fiber rope of placing with parastate each other, as the 1st figure in strengthening layer 6a, 6b, 6c, wherein constituting the strengthening layer 6a that strengthens unit 7,6b, among the 6c, has two layers of reinforced material at least, strengthening layer 6a shown in the 1st figure, 6b, can be staggered strengthening layer 21, use coat at least radial ply tire 5 on turn over regional 3b, and the rope of these layers can leap interlaced with each other, and be positioned at the strengthening layer 6a that constitutes staggered strengthening layer 21 by the outer end of turning over regional 3b on the radial ply tire 5 of the Width of tire outwardly, the outer end 14a of 6b, 14b is on the diametric(al) of tire, can be positioned at radial ply tire 5 on turn over outside the outer end 13 of regional 3b, and constituting each strengthening layer 6a, 6b, the steel wire of 6c or organic fiber rope see through cord sth. made by twisting strand is formed together, the elasticity modulus of each cord is not less than 40GPa, and the bending stiffness of each bar steel wire or organic fiber rope is no more than 2GPamm 4, the bending stiffness (GPamm of each strand 4) result that multiply by at the terminal number (cords/mm) of steel wire or organic fiber rope is 0.012-0.62 (GPamm 4Cords/mm), at adjacent strengthening layer 6a, the stagger angle α between the rope of 6b can surpass 50 ° still less than 130 ° with respect to the circumferencial direction 15 of tire.
" the stagger angle α between the rope of adjacent strengthening layer is exactly α shown in the 2nd figure with respect to the circumferencial direction 15 of tire, and symbol a in the 2nd figure and b represent adjacent strengthening layer 6a, the rope of 6b as mentioned herein.
According to the Pneumatic belt tire among the 1st figure, when under load, rolling, the shearing strain meeting that produces on the Width of tire and circumferencial direction in bead part is dropped to one no matter be in the planarization of radial-ply tyre or implement the renovation again of tire, all enough durable degree, and therefore can obtain excellent durability in the bead part of tire.
In the embodiment of the 1st figure, one deck is with the strengthening layer 6c of rubber coating, its each rope (cord) sees through fine rule sth. made by twisting strand is formed together, the elasticity modulus of per share fine rule is not less than 40GPa, this strengthening layer 6c can be placed between strengthening layer 6b and the radial ply tire 5, and be across on the Width area inside of tire of main part 3a of radial ply tire 5, use the interior distortion of circumferencial direction that control effectively occurs in the main part 3a place of radial ply tire 5, finally be controlled at strengthening layer 6a, separating between every end of 6b and rubber around it, and more promote the rigidity of the bead part in the tire.
Consider down in the balance of durability that satisfies bead part and expendable weight, the more suitable regional side that only turns on carcass is placed strengthening layer.
It is another embodiment of first purpose according to the present invention that the 3rd figure illustrates, again among this embodiment, except the framework in the 1st figure, yielding rubber layer 16 (the 3rd figure in dash area) can be placed on radial ply tire 5 in the tire on turn over the Width outside of regional 3b, use the breaking elongation avoiding producing to strengthening layer 6a at radial ply tire 5,6b is further to improve the durability of tire inner tube circle part.
The 4th figure is another embodiment again of first purpose according to the present invention, and under the framework of the 1st figure, a wide strengthening layer 24 can be used to replace the 1st figure interior strengthening layer 6b and strengthening layer 6c in the present embodiment.The inner 22 of the wide strengthening layer 24 that is placed on the Width of tire, is positioned at the inboard of the main part 3a of radial ply tire 5.This inner 22 is positioned at the outside of diametric outermost end 23 of the tire of the below rubber part 4a that constitutes tyre bead weighting material 4, uses the simplification that makes the tire framework, the attenuating and the cost of manufacture of weight reduces and can realize respectively.
The 5th figure is more another embodiment of first purpose according to the present invention, in this embodiment under the framework of the 4th figure, the wide strengthening layer 24 that turns over the regional 3b outside on the radial ply tire 5 in the Width of tire can be separated into the strengthening layer zone 25a of two separation, 25b.In the case, can change the strengthening layer zone 25a of separation respectively according to purpose, the rope between the 25b angle etc. is set so that the strengthening layer that separates zone 25a, 25b has different rigidity.
In addition, there are misgivings to be exactly, there is interim difference can cause the strengthening layer zone 25a that is separating because be created in the rigidity of separation point 26,25b took place with separating early between its rubber on every side, the separation point 26 of the strengthening layer 24 in the outside of more suitable Width at the tire that turns over regional 3b on the radial ply tire 5 can drop on the radial direction of tire, than the outer end 13 past interior scopes of turning over regional 3b on the radial ply tire 5, to avoid above-mentioned separation.In addition, when separation point 26 is in above-mentioned scope the time, can be placed on the Width of tire, the main part 3a inside of radial ply tire 5, or be placed on the Width of tire, turning over regional 3b outside on the radial ply tire 5, also can be placed on a plurality of positions in addition.
The 6th figure is another embodiment more again of first purpose according to the present invention; in this embodiment under the framework of the 1st figure; strengthening layer 6a in the radial direction of tire; the tire of 6b outer end 14a radially; the tire of 14b position relation radially can be designed to opposite with the embodiment of the 1st figure; contain the interior strengthening layer 6a of Width that can be set at tire with the protective cover 27 of the low rigidity rope (elasticity modulus of cord is less than 40GPa) of rubber coating this moment; the 6b outside; use to allow and be created in strengthening layer 6a; near the 6b outer end 14a, 14b shearing strain can be suppressed by actv..
In addition, up extended beyond strengthening layer 6a in the radial direction at tire, the outer end 14a of 6b when protective cover 27; the position at 14b place; and drop on each interior strengthening layer 6a of Width of tire, when the inside of 6b or outside, can allow the bead part in tire that excellent durability is arranged.
It is according to second embodiment of the invention that the 11st figure illustrates, and under the state that is loaded on the wheel rim, comprises the Width section-drawing of a main part of airtyred bead part.
Tire with the bead part 1 shown in the 11st figure comprises a radial ply tire 5, this radial ply tire 5 comprises on a main part 3a and one and turns over regional 3b, extend between a pair of tyre bead core 2 that is embedded in the cooresponding bead part (the 11st figure only demonstrates a bead part 1) this main part 3a toroid, on turn over regional 3b and extend out by main part 3a, surround just position tyre bead weighting material 4 thereon of tyre bead core 2 and, and constitute and to contain high rigidity rope (concrete, it is that an angle of 70-90 ° is placed that high rigidity rope is used the equatorial plane number of degrees with respect to tire) in the carcass plies 3 that coats with rubber wherein.In addition,, the 11st figure comprises the carcass 5 of a carcass plies 3, if there is the number of the words carcass plies that needs to increase though being expression.
What illustrate in the 11st figure is tyre bead weighting material 4, it comprises two kinds of rubber, that is to say below rubber part 4a that constitutes with harder rubber and the top rubber part 4b that makes with softer rubber, but the framework of tyre bead weighting material of the present invention is not limited to this, also can be single kind of rubber or the rubber more than three kinds constitutes.
Can be further in the bead part 1 of tire, turn over the outside face of regional 3b at least on the carcass 5, be placed one and contain strengthening layer with the high rigidity rope of rubber coating by one deck at least, wherein the 11st figure only illustrates the reinforcement unit 7 that is made of a strengthening layer 6.
In addition, do not illustrate among the figure, tire comprises a belt of being made up of a plurality of rope layers, each rope layer comprises the steel wire of rubberized, and tread area, its outer circumferential sides in the crown zone of carcass 5 can be strengthened by belt, this tread area can provide accurately tread grooves similarly be a plurality of around groove along the circumferencial direction of tire extend with and/or a plurality of lateral grooves in the direction that strides across around groove, extend, can omit these above-mentioned unit according to the purpose of using.
The principal character of the structure of the present invention's second purpose be carcass 5 on turn among the regional 3b, carcass plies 3 is arranged in the outermost at least of the Width of tire at least, and (the carcass plies quantity at the 11st figure is one, carcass plies 3 corresponds to the outermost carcass plies), and the interior strengthening layer of one deck that constitutes strengthening layer 6 can be adjacent (quantity of strengthening layer is one in the 11st figure, and strengthening layer 6 corresponds to interior strengthening layer).More specifically, outermost carcass plies 3 has at least one curve 8 can be under the state of placing along interior strengthening layer 6, change the bearing of trend of rope 9, and be positioned at by upper lateral part 10 of the position outermost carcass plies 3 outward of the curve 8 of the radial direction of tire and strengthening layer 6 form a staggered rope portion 11, upper lateral part 10 is positioned at the outside of curve 8 of the radial direction of tire, and the stagger angle θ 3 between the rope 9,12 of the staggered rope portion 11 of formation is not less than 50 °.
Utilize above-mentioned framework can effectively improve the durability of bead area, and can suppress the increase of weight with the additional designs of strengthening unit 7.
The explanation that the realization of the present invention's second purpose development is will be in following narration detailed.
Tire according to first purpose of the present invention, the bead part of tire is equipped with by the formed at a predetermined angle staggered strengthening layer 21 of multilayer strengthened layer, use with the outer end position of turning over the zone on the covering carcass, so staggered strengthening layer 21 can adsorb the compressive deformation in the outside of the Width that is created in tire, and can not be delivered to compressive deformation on the outer end position 13 of turning over regional 3b, use and the shearing strain of turning on being created on the outer end position 13 of regional 3b significantly can be reduced.But when the framework of bead part was preset as the design of multilayer iron wire strengthening layer, the increase that is not suitable for suppressing weight was very important situation.
So far, the present invention research to be improving the durability of bead part, and this moment, the inhibition of increase of weight was that arrangement with strengthening layer 7 realizes.
As a result, when the carcass plies 3 that turns over regional 3b on the formation is a radial ply tire, can be placed on the radial direction, just as those carcass plies parts at the main part 3a of carcass 5 at the last rope 9 that turns over the carcass plies part of regional 3b.The present inventor find to have at least a curve 8 that changes the bearing of trend of rope 9 can be formed on the outermost carcass plies 3 on turn in the regional 3b, prolonging interior strengthening layer 6, and be positioned at scope by the bearing of trend of the rope 9 of curve 8 to the upper area 10 of outer end 13 can by radial direction fixed angle and tilting, so be created in casingply 3 on turn over regional 3b outer end 13 shearing strain can be suppressed.
In addition, when one of formation between cord that the upper area 11 of outermost carcass plies 3 is used to zone 11 up and the interior strengthening layer 6 with respect to the tire circumferential direction among the 12a figure, when its stagger angle θ 3 is not less than 50 ° staggered rope district 11, that can find to obtain in the durability of bead part and the tire of first purpose with a plurality of strengthening layers (concrete is the iron wire strengthening layer) according to the present invention is the same, and can reach the purpose of expendable weight, the result can reach second purpose of the present invention.
In addition, it is that the distortion that results from circumferencial direction under load can't be reduced by actv. because when less than 50 ° that the stagger angle of why restricting will be limited in the reason that is not less than 50 °, and the problem of the deterioration of its durability of bead part will produce.
In second purpose of the present invention, the position relation between the outer end 13 of outermost carcass plies 3 and the outer end 14 of the interior strengthening layer 6 in the radial direction of tire also need not be limited especially.The modes of emplacement of the outer end 13 of outermost carcass plies 3 by the outer end 14 of the interior strengthening layer 6 in the radial direction of tire toward in, shown in the 11st figure, or outward, shown in the 14th figure by the outer end 14 of the interior strengthening layer 6 in the radial direction of tire.Under any circumstance, the circumferencial direction 15 that more suitable is with respect to tire, it is 20-55 ° that rope 12 in interior strengthening layer 6 extends angle θ 1 scope, and is 30-55 ° with respect to extension angle θ 2 scopes of the rope in the upper area 10 of the circumferencial direction 15 outermost carcass pliess 3 of tire.When circumferencial direction 15 with respect to tire, when the rope 12 in interior strengthening layer 6 extends angle θ 1 less than 20 °, shearing strain meeting on Qu Yu the circumferencial direction worsens endways, and when angle surpasses 55 °, shearing strain meeting on Qu Yu the Width worsens endways, in other words when circumferencial direction 15 with respect to tire, when the rope in the upper area 10 of outermost carcass plies 3 extends angle θ 2 less than 30 °, shearing strain meeting in Qu Yu the circumferencial direction worsens endways, and when angle surpassed 55 °, the shearing strain meeting on Qu Yu the Width worsened endways.
13a figure and 13b figure are the test result of an embodiment, the outer end 13 of the outermost carcass plies 3 of this embodiment be positioned at by the outer end 14 of the strengthening layer 6 of the radial direction of tire toward.In 13a figure, draw and see through the circumferencial direction 15 that changes with respect to tire, the extension angle θ 1 of the rope 12 in interior strengthening layer 6, the outer end position 14 place's Widths of the interior strengthening layer 6 in the radial direction of tire and the shearing strain of circumferencial direction; Draw among the 13b figure when extension angle θ 1 is 20 °, change the deflection on the bead part of stagger angle θ 3 in circumferencial direction.In addition, the Width and the shearing strain in the circumferencial direction that are presented on the outer end position of the interior strengthening layer in the radial direction of tire among the 13a figure can the index of reference value be represented, standard tire value in the present invention is 100, and the deflection index of reference value of the bead part in the circumferencial direction of 13b figure is represented, known tire is 100 with standard.
As the result who in 13a and 13b figure, sees, in the framework of the bead part of the 11st figure, when circumferencial direction 15 with respect to tire, when the extension angle θ 1 of the rope 12 in interior strengthening layer 6 does not surpass 55 °, shearing strain meeting Be Controlled in outer end position 14 place's Widths of interior strengthening layer 6, and when extending angle θ 1 not less than 20 °, be controlled in the shearing strain meeting of circumferencial direction; In addition when stagger angle θ 3 is not less than 50 °, can the actv. Be Controlled in the distortion of circumferencial direction, this sees viewpoint of improving durability is happy.
In addition, 15a and 15b figure are the test results of an embodiment, and the outer end 13 of the outermost carcass plies 3 of this embodiment is to be positioned at by the outer end 14 of the strengthening layer 6 of the radial direction of tire outward.In 15a figure, draw and see through the circumferencial direction 15 that changes with respect to tire, the extension angle θ 2 of the rope in the top 10 of outermost carcass plies 3, the outer end position 13 place's Widths of the outermost carcass plies 3 in the radial direction of tire and the shearing strain of circumferencial direction; Draw among the 15b figure when extension angle θ 2 is 30 °, change the deflection on the bead part of stagger angle θ 3 in circumferencial direction.In addition, be presented on 15a figure the interior shearing strain of the Width on the outer end position of interior strengthening layer and circumferencial direction can the index of reference value represent, standard tire value in the present invention is 100, and the deflection index of reference value of the bead part in the circumferencial direction of 15b figure is represented, known tire is 100 with standard.
As the result who in 15a and 15b figure, sees, in the framework of the bead part of the 14th figure, when circumferencial direction 15 with respect to tire, when the extension angle θ 2 in the upper section 10 in outermost carcass plies 3 does not surpass 55 °, shearing strain meeting Be Controlled in the outer end position place of outermost carcass plies 33 Widths, and when extending angle θ 2 not less than 30 °, be controlled in the shearing strain meeting of circumferencial direction; In addition as stagger angle θ 3 during not less than 50 °, can the actv. Be Controlled in the distortion of circumferencial direction, this sees viewpoint of improving durability is happy.
In addition, more suitably be to use the bearing of trend that changes rope 9 such as roller etc. in one direction, form curve 8 according to wherein plastic deformation; In this case, more suitable is to utilize the roller process to remove the distortion that additionally is created in the compressive load direction.
Shown in the 14th figure, see through mounting of tyre on the wheel rim of a standard and impose maximum gas pressure tire-super wheel under the equipment state thereon, more suitable is curve 8 location, what so measure in the radial direction of tire is exactly by the height point P of the rim flange Rf distance L 2 to the position of curve 8, is 0.01-0.5 times to the distance L 1 of the outer end position 13 of outermost carcass plies 3.When distance L 2 during less than 0.01 times, can be inclined to the rope that causes carcass can be produced by the problem that compressing stress destroyed from rim flange Rf, and when it surpasses 0.5 times, and the effect that the enough inhibition that produced via staggered rope portion 11 are out of shape just can't obtain.
Utilizing staggered rope portion to obtain under the considering of enough Deformation control effects, the length of the staggered rope portion 11 in the radial direction of tire is more suitable for being not less than 20mm.
In addition, by high rigidity rope 9,12 constitute at least in outermost carcass plies 3 and the interior strengthening layer 6, utilize staggered rope portion 11 to obtain under the considering of enough Deformation control effects, more suitable is with steel cable or aromatic polyamides dead drunk (aramid) textile rope, and be not less than 40GPa at all interior elasticity moduluss of rope that constitute these high rigidity ropes 9,12.
In addition, use at this " constitute the elasticity modulus of all cords of high rigidity rope " be illustrated in cord in the state of the not twisting with the fingers strand elasticity modulus of stretching down.
In second purpose of the present invention, regional 3b side placement strengthening layer 6 is at least only turned in utilization on carcass 5 just be enough to form staggered rope portion 11.Shown in the 16th figure, on the viewpoint of expendable weight, the more suitable strengthening layer 6 that only on carcass 5, turns over the narrow width of placement one deck of regional 3b side.
But, under the situation of improved importance greater than expendable weight at the durability of bead part, shown in the 17th and 18 figure, strengthening layer 6 that can one deck is wide is placed on by turning on the carcass 5 on the zone of regional 3b side between the main part 3a wherein, or places a plurality of strengthening layers.
Even in follow-up situation,,, the quantity of the strengthening layer of placing 6 still can provide same durability to bead part even reducing to when having only one deck when second purpose of the present invention is used for and first purpose of the present invention mutually relatively the time.
If when needing strain that 13 places, outer end of the outer end 14 of the interior strengthening layer 6 of control further and outermost carcass plies 3 produce, can be by the inside in the Width of tire with outside, clamp a pair of yielding rubber layer 16a of outer end 13 with the outer end 14 of interior strengthening layer 6 of outermost carcass plies, 16b can be placed in the radial direction of tire and comprise on the zone of these outer ends 13,14.Preferably yielding rubber layer 16a, the rubber hardness scope of 16b is in the parts that constitute outermost carcass plies 3 and interior strengthening layer 6, be positioned at outside the radial direction of tire, 0.95-1.05 with the unit 3 of outer end 13 or 14 or rubber of 6 doubly, this is fit to be used for controlling and is created in the growth of rupturing in outer end 13 and 14 places.
In addition, by the viewpoint of making, yielding rubber layer 16a, 16b more suitably be use with the rubber that constitutes interior strengthening layer 6 and the rubber phase that constitutes outermost carcass plies 3 with.
In addition, in the viewpoint of improving the bead part durability, more suitable is with the young's modulus with high consume " E " yielding rubber layer 16a, 16b.
In addition, if need further be controlled at outer end 13, the words of 14 each locational distortion, shown in the 18th figure, section by the Width of tire, more suitable is when the position of the staggered rope portion outer end of the radial direction by tire interior (in the 18th figure on turn over the outer end position 13 of regional 3b), and a normal moving outer surface of tire to is n1, and the position by (outer end position 14 of the interior strengthening layer in the 18th figure) outermost end more outward in the tire radius direction in the outer end position of the outer end position of interior strengthening layer and outermost carcass plies, and a normal moving outer surface of tire to is n2.On normal n1, measure, by between the outer end position 13 of the rope center of the base portion 3a of the casingply staggered rope portion 11 to the radial direction of tire apart from Gt1 can be with aforesaid way measure to outer surface of tire apart from the 0.4-0.7 of Gt doubly; And on normal n2, measure, by between rope center to the outermost end position 14 of the base portion 3a of casingply apart from Gf1 be measure in the same manner described above outer surface of tire apart from the 0.7-0.9 of Gf doubly.
Because being created in the separation at the place, outer end of the staggered rope portion 11 in the radial direction of tire mainly is to be caused by the distortion of the torsion in the circumferencial direction 15 of tire, more suitable is that such outer end position will be placed near the center shaft of torsion distortion, that is to say, by the viewpoint that control separates, will be between 0.4-0.7 times of distance Gt apart from the scope of Gt1.In addition, when the outermost end of the Width that is positioned at tire toward rubber part enough thick, the scope apart from Gf1 of that is to say is apart from the 0.7-0.9 of Gf doubly, can be alleviated at the compressing stress of outermost end, and therefore can Be Controlled in the separation of outermost end.
In the 19th figure, draw and change the strain stress relation of distance rates Gt1/Gt on the outer end position of staggered rope; In the 20th figure, draw and change the strain stress relation of distance rates Gf1/Gf in outermost end.
As the result who sees at the 19th figure and the 20th figure, it is characterized in that scope apart from Gt1 is apart from the 0.4-0.7 of Gt doubly, and be that apart from the 0.7-0.9 of Gf doubly these are helpful to the stress on the everywhere that is controlled at outer end 13,14 apart from the scope of Gf1.
Though the above-mentioned embodiments of the invention of only mentioning, various changes can be made within the scope of the invention uses.
Description of drawings
The 1st figure illustrates and is first purpose according to the present invention, the drawing in side sectional elevation of the bead part in the gas radial-ply tyre;
The 2nd figure is an enforcement illustration of the staggered rope between adjacent strengthening layer;
The 3rd figure illustrates and is first purpose according to the present invention, at the drawing in side sectional elevation of the bead part of gas radial-ply tyre;
The 4th figure illustrates and is first purpose according to the present invention, at the drawing in side sectional elevation of the bead part of gas radial-ply tyre;
The 5th figure illustrates and is first purpose according to the present invention, at the drawing in side sectional elevation of the bead part of gas radial-ply tyre;
The 6th figure illustrates and is first purpose according to the present invention, at the drawing in side sectional elevation of the bead part of gas radial-ply tyre;
It is the section-drawing of known gas radial-ply tyre that the 7th figure illustrates;
It is the section-drawing of known another kind of gas radial-ply tyre that the 8th figure illustrates;
The 9th figure illustrate into the durability of bead part and the stagger angle α between the rope of adjacent strengthening layer (°) graph of a relation;
The 10th figure illustrates the bending stiffness (GPamm into the durability of tire bead portion and every rope 4) multiply by the graph of a relation between the result of terminal amount (cords/mm);
The 11st figure illustrates the drawing in side sectional elevation into the gas radial tyre bead portion of second purpose according to the present invention;
12a figure illustrates at the rope on outermost top and at the transparent view of the bearing of trend of the rope of interior strengthening layer;
12b figure illustrates at the rope on outermost top and at the planar view of the bearing of trend of the rope of interior strengthening layer;
13a figure is a chart, corresponding to the circumferencial direction 15 of tire, is when utilizing the extension angle θ 1 that changes the rope in the interior strengthening layer 6, outer end position 14 place's Widths of the interior strengthening layer 6 in the radial direction of tire and the shearing strain in the circumferencial direction;
13b figure is a chart, when extension angle θ 1 is 20 °, utilizes to change the deflection of stagger angle θ 3 in the bead part of circumferencial direction;
The 14th figure illustrates the drawing in side sectional elevation into another example of bead part;
15a figure is a chart, corresponding to the circumferencial direction 15 of tire, is when utilizing the extension angle θ 2 that changes the rope in the outermost carcass plies 3, outer end position 13 place's Widths of the outermost carcass plies 3 in the radial direction of tire and the shearing strain in the circumferencial direction;
15b figure is a chart, when extension angle θ 2 is 30 °, utilizes to change the deflection of stagger angle θ 3 in the bead part of circumferencial direction;
The 16th figure is the drawing in side sectional elevation of another example of bead part;
The 17th figure is the drawing in side sectional elevation of another example of bead part;
The 18th figure is the drawing in side sectional elevation of another example of bead part;
The 19th figure is under the ratio of Gt1/Gt, the strain of the outer end position of staggered rope portion;
The 20th figure is under the ratio of Gf1/Gf, the strain of the extreme end position of staggered rope portion;
The 21st figure illustrate into when general tire is walked under load at the deformation state of bead part;
The 22nd figure is the drawing in side sectional elevation of the interior bead part of the tire of known example; And
The 23rd figure is the drawing in side sectional elevation of the interior bead part of the tire of a comparison power.
Description of reference numerals
1: bead part 2: the tyre bead core
5: carcass 3a: base portion
3b: on turn over the zone 4: rubber part
4a: below rubber part 4b: top rubber part
6a, 6b, 6c, 21: strengthening layer
7: strengthen unit R f: rim flange
13,14a, 14b, 14c: rope outer end
15 circumferencial directions 16,16a, 16b yielding rubber layer
The inner, inside of 24 wide strengthening layer 22 base portions
The outer end of 23 below rubber parts
25a, the strengthening layer zone that 25b separates
26 separation points, 27 protective coveres
Turn over the zone on 8 curves 10
11 staggered rope portions, 9,12 ropes
Turn over the outer end of regional 3b on 13
The outer end of 14 interior strengthening layers 6
α, θ 1, and θ 2, θ 3 angle n1, n2 normal
D, L1, L2, Gt1, Gt, Gf1, Gf distance
The specific embodiment
Embodiment 1
At the present invention's first purpose, can make air-inflation tyre at the bead part of tire and also be assessed.
All testing tires all are the gas radial-ply tyres that is used for truck and bus, are of a size of 285/60R22.5.All comparative example tire 1-6 and example tire 1-9 have each size that indicates in the table 1-4, and the structure beyond these sizes and be used for truck and bus generally to use the gas radial-ply tyre always identical.In table 1-4, be presented at the strengthening layer size of each testing tire.
[table 1]
Comparative example tire 1 Comparative example tire 2 Comparative example tire 3 Comparative example tire 4
Reference diagram The 7th figure The 7th figure The 8th figure The 1st figure
Strengthening layer etc. (1) (L/0.3/0.063/L45/31) (L/0.3/0.063/L45/31) (L/0.3/0.063/L45/36) (H/210/0.76/L45/6a)
Strengthening layer etc. (2) (L/0.3/0.063/R45/32) (L/0.3/0.063/R45/32) (L/0.3/0.063/R45/37) (H/210/0.76/L45/6b)
Strengthening layer etc. (3) (L/0.3/0.063/L45/33) (H/210/0.109/R30/35) (H/210/0.44/L30/38) (H/210/0.0109/R30/6c)
Strengthening layer etc. (4) (L/0.3/0.063/R45/34) - (H/210/0.109/R30/39) -
Strengthening layer etc. (5) (H/210/0.109/R30/35 ) - - -
[table 2]
Comparative example tire 5 Comparative example tire 6 Example tire 1 Example tire 2
Reference diagram The 1st figure The 1st figure The 1st figure The 1st figure
Strengthening layer etc. (1) (H/210/0.0096/L45/6a) (H/210/1.12/L45/6a) (H/210/0.15/L45/6a) (H/210/0.61/L45/6a)
Strengthening layer etc. (2) (H/210/0.0096/R45/6b) (H/210/1.12/L45/6b) (H/210/0.15/R45/6b) (H/210/0.61/R45/6b)
Strengthening layer etc. (3) (H/210/0.0109/R30/6c) (H/210/0.0109/R30/6c) (H/210/0.109/R30/6c) (H/210/0.109/R30/6c)
Strengthening layer etc. (4) - - - -
Strengthening layer etc. (5) - - - -
[table 3]
Example tire 3 Example tire 4 Example tire 5 Example tire 6
Reference diagram The 1st figure The 1st figure The 1st figure The 3rd figure
Strengthening layer etc. (1) (H/210/0.014/L45/6a) (H/210/0.15/L60/6a) (H/210/0.15/L30/6a) (H/210/0.15/L45/6a)
Strengthening layer etc. (2) (H/210/0.014/R45/6b) (H/210/0.15/R60/6b) (H/210/0.15/R30/6b) (H/210/0.15/L45/6b)
Strengthening layer etc. (3) (H/210/0.109/R30/6c) (H/210/0.109/R30/6c) (H/210/0.109/R30/6c) (H/210/0.109/R30/6c)
Strengthening layer etc. (4) - - - -
Strengthening layer etc. (5) - - - -
[table 4]
Example tire 7 Example tire 8 Example wheel 9
Reference diagram The 4th figure The 5th figure The 6th figure
Strengthening layer etc. (1) (H/210/0.15/L45/6a) (H/210/0.15/L45/6a) (H/210/0.15/L45/6a)
Strengthening layer etc. (2) (H/210/0.15/R45/24) (H/210/0.15/R45/24) (H/210/0.15/R45/6b)
Strengthening layer etc. (3) - - (H/210/0.109/R30/6c)
Strengthening layer etc. (4) - - (L/0.3/0.01/L45/27)
Strengthening layer etc. (5) - - -
In addition, the size Expressing of the every layer strengthening layer of table among the 1-4 (rope of strengthening layer is high rigidity rope or be not/constitute each the bending stiffness (GPamm of elasticity modulus/every rope of cord of rope 4) multiply by the result (GPamm of terminal number (cords/mm) 4Cords/mm)/rope is corresponding to the extension angle of circumferencial direction (°)/reference diagram).
In table 1-4; " strengthening layer etc. " if be that expression has been settled 27 of protective coveres to have to comprise a protective cover; and strengthening layer under the state that uses high rigidity rope with " H " represent; under the state that uses low rigidity rope with " L " represent; restrict with respect to the extension angle of the circumferencial direction of tire (°) the expression mode then is; when by mounting of tyre under the state on the vehicle; up be viewed as by the right with respect to the equatorial plane of tire " R "; if the words of up being observed by the left side are expressed as " L ", be connected on " R " or " L " and after numeral with respect to the angle of tire equator face.
In addition, the bending stiffness (GPamm of each rope 4) be to represent with following formula:
Equation: D=2Ncos β/{ 1+cos 2β }/EI+sin 2β/GI P
G＝E/2(1+μ f)
Wherein, N is the fine rule number of each strengthening layer, and β is the sth. made by twisting strand angle of fine rule, and E is a young's modulus, and G is the cross-sectional plane elasticity modulus, and I is the moment of inertia (the I=π/64 * d of area 4, I P=π/32 * d 4, " d " is the diameter of fine rule), and μ fIt is the Poisson ratio (Poisson ' s ratio) of fine rule.
The assessment system of the durability of tire bead portion sees through tire speed rolling tire with 60 kilometers/hour on the drum type test machine of a radius 1.7m and carries out, till the bead part breakage, can be that wheel rim that 900kPa uses is under 9.00 * 22.5 the situation in maximum gas pressure simultaneously, impose 1.5 times load 47.3kN corresponding to maximum load power 31.5kN.
The durability result of tire bead portion can be presented in the table 5, and wherein the assessment numeral of durability is to be benchmark with comparative example tire 1 (100), and wherein the durability of the big more expression tire bead of numerical value portion is good more.
[table 5]
The durability of bead part
Comparative example tire 1 100
Comparative example tire 2 60
Comparative example tire 3 90
Comparative example tire 4 85
Comparative example tire 5 80
Comparative example tire 6 20
Example tire 1 145
Example tire 2 120
Example tire 3 115
Example tire 4 115
Example tire 5 118
Example tire 6 160
Example tire 7 135
Example tire 8 145
Example tire 9 165
By table 5, the durability of the tire bead portion in all example tire 1-9 all will be got well much than the result of those comparative example tires 1-6.
Embodiment 2
First purpose according to the present invention, in air-inflation tyre with the bead part framework shown in the 1st figure, utilize the circumferencial direction that changes with respect to tire in the air-inflation tyre, the stagger angle α of the rope of adjacent strengthening layer (°) coming the scrupulous durability of assessing tire bead portion, the result of assessment is shown in the 9th figure.
By the result of the 9th figure, when the scope of stagger angle α in 50＜α＜130 (°) time have an excellent durability.
In addition, in the 9th figure when the stagger angle α of tire (°) when being 50 °, the durability of tire bead portion is evaluated as 100 by pointer.
Embodiment 3
In air-inflation tyre, utilize the bending stiffness (GPamm that changes each rope with the bead part framework shown in the 1st figure 4) multiply by the result (GPamm of terminal number (cords/mm) 4Cords/mm) assess the durability of tire bead portion, the result of assessment is shown in the 10th figure.
By the result of the 10th figure, as the bending stiffness (GPamm of each rope 4) multiply by the result (GPamm of terminal number (cords/mm) 4Cords/mm) scope is 0.012-0.62 (GPamm 4Cords/mm) time, has excellent durability.
In addition, the bending stiffness (GPamm that in the 10th figure, works as each rope 4) multiply by the result (GPamm of terminal number (cords/mm) 4Cords/mm) be at 0.012 o'clock, the durability of tire bead portion is evaluated as 100 by pointer.
Embodiment 4
At the present invention's second purpose, can make air-inflation tyre and be assessed as follows at the bead part of tire.
Example 1
Tire in the example 1 is the gas radial-ply tyre that is used for truck and bus, the framework of its bead part is shown in the 11st figure, be of a size of 285/60R22.5, wherein the wide strengthening layer (iron wire strengthening layer) of one deck can be placed on by turning over the zone on the carcass to a scope between its main part, and the stagger angle that constitutes the rope of staggered rope portion is 90 °, rope in interior strengthening layer is 45 ° with respect to the extension angle of the circumferencial direction of tire, turn over rope in the zone on the outermost carcass plies with respect to 45 ° of the extension angles of the circumferencial direction of tire, and curve system location be to measure in the radial direction of tire be for by the eminence of rim flange to 1.5 times position of the distance of an outer end position of outermost carcass plies, staggered rope minister degree at the radial direction of tire is 24mm, constituting each outermost carcass plies is steel wire with the highest rigidity rope of interior strengthening layer, so constituting the elasticity modulus of the cord of high rigidity rope is 3100GPa, and distance rates Gt1/Gt is 0.64, and distance rates Gf1/Gf is 0.83.
In addition, other structure of tire is identical with gas radial-ply tyre on generally being used in truck and bus.
The tire of example 2 is a kind of tires with the bead part framework among the 16th figure, and except only placing on the zone the narrow strengthening layer (iron wire strengthening layer) of one deck turning on the carcass, and it has the structure same with example 1.
Comparative example
The tire of comparative example is a kind of tire with the bead part framework that illustrates as the 23rd figure, and except following difference, have the structure identical with the 1st figure, bead part be not formed in turn over the zone in and two-layer iron wire strengthening layer 20a, 20b places and can allow the stagger angle of rope drop in 90 °, and cover the outer end of turning over the zone, and have one deck yielding rubber be placed on carcass in the Width of tire on turn over the zone the outer end the outside and between the inside face of iron wire strengthening layer, to be controlled at the torsion on the outer end position.
Known example
Tire in the known example is a kind of tire with the bead part framework shown in the 22nd figure, and except following difference, have the structure identical with the 1st figure, bead part is not turned in the zone last, can place one deck iron wire strengthening layer 17 and four layers of nylon strengthening layer 18a-18d, one deck yielding rubber 19 can be placed on the carcass in the Width of tire and turn between the outside, outer end and iron wire strengthening layer inside face in zone, to be controlled at the torsion at outer end position place.
The assessment of the durability of bead part can utilize each testing tire device on a standard wheel rim (9.00 * 22.5), and on the drum type test machine of a radius 1.7m with 60 kilometers/hour speed in maximum gas pressure be 900kPa and impose corresponding to 1.5 times the load of maximum load power 30.87kN under measure tire rolling distance till the bead part breakage, the result of assessment is illustrated in table 6.
[table 6]
The bead part durability Tire weight (kgf)
Known example 100 49.8
Comparative example 150 52.3
Example 1 150 49.2
Example 2 168 48.7
As the result who sees in table 6, compared to known example, example 1 and 2 durabilitys in bead part all present good result, also equate with comparative example or better at the durability of bead part in addition, and can reach the minimizing tire weight.
Commercial Application
According to the first purpose of the present invention and the second purpose, can be provided in the pneumatic tire that bead part has excellent durability.
Specifically, according to the second purpose of the present invention, can utilize the outermost casing ply that turns over location at carcass that the pneumatic tire with improvement durability is provided, and can utilize the arrangement of strengthening layer to suppress the increase of weight.

Claims (15)

1. an air-inflation tyre comprises radial ply tire and tyre bead weighting material; This radial ply tire is made of at least one body piles, this body piles comprises on a main part and one and turns over the zone, extend between the tyre bead core that is embedded in pair of bead portion respectively this main part toroid, can extend and winding tyre bead core and the position tyre bead weighting material above above-mentioned tyre bead core by base portion and turn over the zone on being somebody's turn to do; This tyre bead weighting material comprises a below rubber part and a top rubber part, and the rubber part of this below is arranged on the exterior circumferential surface adjacent to the tyre bead core; The diametric(al) outside of the tire of the rubber part of rubber part position below this of this top, its rigidity can be also lower than below rubber part; It is characterized in that this air-inflation tyre also comprises the reinforcement unit, this reinforcement unit is made of the two-layer at least strengthening layer with the rubber coating, each strengthening layer contains steel wire or the organic fiber rope of placing with parastate each other, and constituting at least two strengthening layers of strengthening the unit, it is staggered strengthening layer, use surround at least radial ply tire on turn over the zone, and allow these layers interlaced with each other across, being positioned at by two outer ends that constitute the strengthening layer of staggered strengthening layer in the outer end of turning over the zone on the radial ply tire of tire width direction outwardly is to be placed on the outside of turning over the place, an outer end in zone on the radial ply tire in the tire diameter direction outside, and the steel wire or the organic fiber rope that constitute each strengthening layer are to see through fine rule sth. made by twisting strand is formed together, wherein the elasticity modulus of each bar fine rule is not less than 40GPa, and each bar steel wire or the bending stiffness of organic fiber line is no more than 2GPamm 4, the bending stiffness (GPamm of each strand of product 4) with product at the terminal number (cords/mm) of steel wire or organic fiber rope be 0.012-0.62 (GPamm 4Cords/mm), the periphery direction that the stagger angle between the rope of adjacent strengthening layer (α) corresponds to tire can surpass 50 degree, but less than 130 degree.
2. air-inflation tyre as claimed in claim 1, wherein the strengthening layer in constitute strengthening the strengthening layer of unit is a wide strengthening layer, uses a zone that surrounds radial ply tire, this area division by on turn over the zone and extend toward main part; The wide strengthening layer that is placed, the inner of Width of tire that it is positioned at the main part of radial ply tire is placed on the diametric(al), by the outside of the outer end of the below rubber part of the tyre bead weighting material that constitutes tire.
3. air-inflation tyre as claimed in claim 2, wherein this wide strengthening layer is to be made of a plurality of separation strengthening layers zone along the circumferencial direction of tire respectively.
4. as claim 1,2 or 3 described air-inflation tyres; set protective cover; this protective cover uses rubber coating cotton rope; this cotton rope is to twist with the fingers strand by each elasticity modulus less than the fiber of 40Gpa to form together; this protective cover is being strengthened between unit and the carcass in order to surround at least, and/or turns over the outer end in the outside, zone on the radial ply tire of the tire width direction of staggered strengthening layer.
5. as each described air-inflation tyre in the claim 1, wherein a yielding rubber layer can be placed on tire width direction radial ply tire on turn over the outside in zone.
6. as each described air-inflation tyre in the claim 1, wherein this strengthening layer only be placed on carcass on turn over edges of regions.
7. air-inflation tyre, comprise carcass and strengthen the unit, this carcass by main part and on turn over zone institute and constituted, extend between the tyre bead core that is embedded into pair of bead portion respectively the base portion toroid, this carcass is made of at least one line layer, this carcass plies is with the rubber coating, on turn over the zone and can extend and twine the tyre bead core by main part, and the high rigidity rope of its meta in base portion can be along radially placing, this reinforcement unit is made of at least one strengthening layer, and this strengthening layer is made of the high rigidity rope that is coated with rubber; It is characterized in that on constituting this, turning in the carcass plies in zone, at least be arranged in the outermost carcass plies of the outermost carcass plies of this tire width direction, this outermost carcass plies has at least one curve, this curve changes the bearing of trend of rope, and this outermost carcass plies is along the most inboard strengthening layer that is positioned at outside layer on the adjacent strengthening layer; And this air-inflation tyre also is formed with a staggered rope portion, should staggered rope portion be formed, and the rope of the staggered rope section of formation can be less than 50 ° with respect to a stagger angle of the circumferencial direction of this tire by upper lateral part that is positioned at the tire outermost radial outside and inner most strengthening layer.
8. air-inflation tyre as claimed in claim 7, wherein with respect to the circumferencial direction of this tire, extension angular range at the rope of this inner most strengthening layer is 20 °-55 °, and is 30 °-55 ° with respect to the circumferencial direction of this tire at the extension angular range of the rope of this outermost strengthening layer.
9. as claim 7 or 8 described air-inflation tyres, this curve wherein, the wheel frame that tire is installed in standard with impose under the maximum air pressure state thereon, be in the 0.01-0.5 scope doubly of the distance between a position of counting outermost carcass plies outer end by the height of wheel frame flange.
10. air-inflation tyre as claimed in claim 7 wherein can be less than 20mm in a length of the diametric staggered rope section of tire.
11. as each described air-inflation tyre of claim 7, wherein constituting at least, the high rigid cord of outermost carcass plies and inner most strengthening layer is steel wire or aromatic polyamides dead drunk (aramid) textile rope.
12., wherein use the elasticity modulus that constitutes all cords of high rigid cord at outermost carcass plies and inner most strengthening layer to be not less than 40Gpa at least as each described air-inflation tyre of claim 7.
13. as each described air-inflation tyre in the claim 7, wherein this strengthening layer only is placed on a side of turning over the zone on the carcass.
14. as each described air-inflation tyre in the claim 7, also comprise a pair of yielding rubber layer, in the radial extension of the diametric outer end of the tire of outer end that comprises the outermost carcass plies and inner most strengthening layer, this to the yielding rubber layer by the outside of the Width of tire and inboard clamp above-mentioned outside end, this is to hardness of yielding rubber layer 0.95-1.05 for the hardness of the rubber that constitutes the outer end with the outer end that is arranged in the outermost carcass plies and inner most strengthening layer more lateral.
15., wherein work as the normal n1 of an outer surface of tire, the outer end position of passing the diametric staggered rope section of tire as each described air-inflation tyre in the claim 7; And the normal n2 of an outer surface of tire, when passing on the tire diameter direction of outer end position of the outer end position that is positioned at inner most strengthening layer and outermost carcass plies an outermost outermost end position, section from the Width of tire, on normal n1, measure by the rope center of the main part of body piles toward the distance of the outer end position of the staggered rope portion of tire diameter direction be with said method the outside face amount of tire to a distance 0.4-0.7 doubly, and be 0.7-0.9 times of outside face distance that measures tire with mode same as described above toward the distance between the position of outermost end measuring on the normal n2 by the rope center of the main part of body piles.
CNB028030397A 2001-07-10 2002-07-09 Pneumatic tyre Expired - Fee Related CN1325291C (en)

Applications Claiming Priority (9)

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JP209241/01 2001-07-10
JP209241/2001 2001-07-10
JP2001209241 2001-07-10
JP268229/2001 2001-09-05
JP2001268229A JP4559672B2 (en) 2001-07-10 2001-09-05 Pneumatic radial tire
JP268229/01 2001-09-05
JP2001393069A JP4070454B2 (en) 2001-12-26 2001-12-26 Pneumatic tire
JP393069/01 2001-12-26
JP393069/2001 2001-12-26

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CN1476388A (en) 2004-02-18
US7188655B2 (en) 2007-03-13
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EP1405736A1 (en) 2004-04-07
EP1405736B1 (en) 2011-01-05

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